Sampling value linear interpolation operator and calculation method based on fpga

Abstract

The invention relates to an FPGA-based sampling value linear interpolation operator and an operation method. The operator includes: an adder / subtractor, a multiplier, an operation data scheduler, a table lookup unit, and a truncation operator. The interpolation operation formula is split step by step, classified as only addition, subtraction and multiplication operations, using time division multiplexing to load intermediate parameters step by step for operation, and according to the current data frame receiving time interval t2‑t1 and its preset The limit T look-up table reads the proportional coefficient k, which is used together with the truncation operator to replace the division operation and use it in the linear interpolation operation to obtain the required Vx value. The invention omits the direct division operation by means of table lookup, reduces the number of adder / subtractors and multipliers by means of time-division multiplexing, and saves a lot of resources. On the premise of completing the established functions, the originally extremely tight hardware resource occupation is effectively alleviated, and a resource margin is reserved for product upgrades without replacing the FPGA chip later.

Description

technical field [0001] The invention relates to the technical field of substation sampling value processing, in particular to an FPGA-based linear interpolation arithmetic unit and operation method for sampling values. Background technique [0002] Interpolation operation is one of the important functions of the sampling value processing device of the smart substation, which is used to transform the data stream collected from afar into a data stream equivalent to that collected locally. Linear interpolation is the most basic and commonly used type of interpolation. It utilizes the sampling values ​​V1 and V2 collected from the variable Vt at time t1 and t2, and assumes the sampling value Vx at time tx in the Vt-t coordinate system It is on a straight line with V1 and V2, so the value of Vx can be obtained by solving the linear equation, and its operation formula is Due to the need for division during calculation, and the resources occupied by the division operation are rel...

AI Technical Summary

Problems solved by technology

Linear interpolation is the most basic and commonly used type of interpolation. It utilizes the sampling values ​​V1 and V2 collected from the variable Vt at time t1 and t2, and assumes the sampling value Vx at time tx in the Vt-t coordinate system It is on a straight line with V1 and V2, so the value of Vx can be obtained by solving the linear equation, and its operation formula is Due to the need for division during calculation, and the resources occupied by the division operation are relatively large, the hardware resources of the FPGA chip are tight; at the same time, addition, subtraction, and multiplication operations need to be repeated during the operation process. If no measures are taken, it will further cause FPGA chips. The hardware resources of the

In view of these situations, if a large-capacity chip is used, the cost will increase significantly, which is not convenient for the popularization of the processor.

Images